How to Select a CCTV Lens?

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1 How to Select a CCTV Lens? Introduction The performance of a CCTV imaging system highly relies on the lens quality. Many installations got poor pictures performance because the installers didn t specify the correct lens during the initial survey. Lens survey doesn t only mean choosing a lens which will cover correct field of view, although this is an important factor, but also need to care the overall image quality after lens installed. In this document, we will introduce some key factors that shall be considered when selecting a lens for surveillance. Table of Content Optical Format... 1 Resolution... 2 Lens Mount... 2 Lens Type... 3 Focal Length... 3 F-Number... 4 IR Correction... 4 Appendix... 5 Doc No K0080 Category Application - Any Models All box s Problem Description How to select a CCTV lens? Remark Release Date 2014/07/21 MESSOA Technologies Inc. No.8, Wuquan Road, New Taipei Industrial Park. Wugu District, New Taipei City Taiwan,R.O.C Tel: Fax:

2 Optical Format The lens optical format shall comply with the size of image sensor, with dimension a little bigger than image sensor. For example: For 1/2 sensor, a lens with optical size >= 1/2 shall be selected. For 1/3 sensor, a lens with optical size >= 1/3 shall be selected. If lens optical format is less than that of a sensor, a dark image on corner may occur. Resolution The lens resolution may not be a problem in the past for traditional analog CCTV s installation where only D1 resolution is required. However, the resolution has jumped to mega-pixel level due to quick evolution of image sensor technology recently, so selecting a resolution-compatible lens for current megapixel IP has become an important requirement to guarantee the overall high resolution character. Depending on resolution, the lens can be categorized as D1, 2M, 3M, etc. You may refer to the Appendix or visit the Messoa website: for all available types from Messoa. For example: To select a lens for Messoa 2 Mega-pixel NCB855PRO, the candidate shall have resolution > = 2M. From the list in appendix, we can choose SLV004 because it just meets the requirement. Although you can select SLV003, however we would not recommend because it far exceeds the specification requirement and cost much. Lens Mount There are two types of lens mount in CCTV industry, C and CS mount, with the flange back length and 12.5 mm as indicated in Fig.1 below. A CS mount lens can only be used with a CS-mount, a C mount lens can be used with a C mount, or with a CS mount plus a 5mm adaptor, but CS mount lens to C mount is prohibited, as summarized in Table 1. Lens C mount lens CS mount lens C mount C mount: flange back=17.526mm CS mount: flange back=12.5mm Fig.1 C vs CS mount CS mount need 5 mm adaptor Table 1. Lens & compatibility 2

3 How to select CCTV lens? Lens Type We can categorize CCTV lens into two types, one is manual iris and the other one is auto iris type. Manual iris lens is good for environment with stable lighting condition, while auto iris lens, with the ability to adjust the iris to keep constant video level, is good for environment where lighting condition may vary. There are two kinds of auto iris lens according to their driving method: 1. Video drive type: controlled by video signal with separate power from 2. Direct drive type: controlled by direct-current (dc) driving signals from. In general, we recommend users use auto iris lens for getting optimal image quality especially in the following surveillance conditions. In a large field with bright illumination such as a sunny day, an auto iris lens guarantees longer depth of field than using a fixed iris lens. That is to say, we can have clear and sharp image in all the filed. Focal Length We can have wide angle of view with a short focal length lens and narrow angle of view with a long focal length lens. Fig.2 focal length and FOV In fact, the focal length shall depend on how far the object is and what the size of the object we preferred. Next we give an example that will show you how to calculate lens focal length based on field requirement. In this example, we assume the sensor is 1/2 with size (h, v) = (6.4, 4.8) mm. By similar triangle rule, it is easy to calculate the required focal length f by the following formula. f : lens focal length to be calculated v : vertical size of sensor h : horizontal size of sensor V : vertical size of object D : object distance Fig. 3 illustration for focal length calculation f v D V mm 3

4 F-Number F-number represents the amount of light passing through the lens, with smaller number for allowing more amount of incoming light. The rule of thumb for selecting a lens is to select that with smaller F#, because it has bigger aperture and can pass more amount of light, which will in turn help to have better S/N and improve the sensitivity character. Side effect: Bigger aperture will result in shorter range of depth of field, which is not good for surveillance requirement. At this time, an auto iris lens is a good selection to overcome such problem, because the iris will adjust automatically for optimal video level. IR Correction An IR corrected lens is required for a day and night to avoid focus shift if an IR illuminators are in action at night time to provide additional lighting, because the focus point is different for visible and infrared light. Fig. 4 focus shift of visible and infrared light for non-ir corrected lens Fig. 5 no focus shift of visible and infrared light for IR corrected lens 4 Release Date: 2014 Jan.

5 How to select CCTV lens? Appendix The table below lists all available lenses from Messoa. Model SLV003 SLV004 SLV005 SLV006 SLV525 SLV013 Resolution 3M 2M 3M 3M 3M 3M Optical format 1/2.7 1/2.7 1/2.7 1/2 1/3 1/2.7 Focal length mm mm 7-22mm 8 80mm 2.8 8mm 15 50mm Mount CS CS CS C CS CS F # F1.4 F14 F1.4 F1.6 F1.2 F1.5 IRIS control DC IRIS DC IRIS DC IRIS DC IRIS DC IRIS DC IRIS IR corrected YES YES YES YES -- YES Model SLV521 SLV524 SLV524PRO SLV532 SLV562 SLV563 Resolution D1 D1 D1 D1 D1 D1 Optical format 1/3 1/3 1/3 1/3 1/3 1/2 Focal length 3 8mm mm mm mm 5 60mm mm Mount CS CS CS CS CS C F # F0.95 F1.2 F1.2 F1.3 F1.6 F1.6 IRIS control DC IRIIS DC IRIS DC IRIS DC IRIS DC IRIS DC IRIS IR corrected YES YES YES YES

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